#region License, Terms and Author(s)
//
// TempRESS - TEMPlate Rendering Engine that's Small and Simple 
// Copyright (c) 2009 Atif Aziz. All rights reserved.
//
//  Author(s):
//
//      Atif Aziz, http://www.raboof.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

namespace Tempress
{
    #region Imports

    using System;
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.Diagnostics;

    #endregion

    [Serializable, DebuggerDisplay("Count = {Count}")]
    public sealed class TemplateArgumentCollection : KeyedCollection<string, TemplateArgument>
    {
        private bool isReadOnly;

        public TemplateArgumentCollection() :
            base(StringComparer.Ordinal) { }

        public static TemplateArgumentCollection ReadOnly(IEnumerable<TemplateArgument> args)
        {
            var collection = new TemplateArgumentCollection();
            foreach (var arg in args)
                collection.Add(arg);
            collection.isReadOnly = true;
            return collection;
        }

        protected override string GetKeyForItem(TemplateArgument item)
        {
            return item.Name;
        }

        protected override void ClearItems()
        {
            DemandWriteAccess();
            base.ClearItems();
        }

        protected override void InsertItem(int index, TemplateArgument item)
        {
            DemandWriteAccess();
            base.InsertItem(index, item);
        }

        protected override void RemoveItem(int index)
        {
            DemandWriteAccess();
            base.RemoveItem(index);
        }

        protected override void SetItem(int index, TemplateArgument item)
        {
            DemandWriteAccess();
            base.SetItem(index, item);
        }

        private void DemandWriteAccess()
        {
            if (isReadOnly)
                throw new InvalidOperationException("Collection is read-only.");
        }
    }
}